Workers of China Railway Nanning Group Co., Ltd conduct maintenance work in south China's Guangxi Zhuang Autonomous Region, Jan. 29, 2026. Railway departments nationwide are actively conducting train maintenance to ensure safe operations during the upcoming 2026 Spring Festival travel rush. (Xinhua/Zhang Ailin)

Workers of China Railway Nanning Group Co., Ltd grind rails in Baise, south China's Guangxi Zhuang Autonomous Region, Jan. 29, 2026. Railway departments nationwide are actively conducting train maintenance to ensure safe operations during the upcoming 2026 Spring Festival travel rush. (Xinhua/Zhang Ailin)

Workers of China Railway Nanning Group Co., Ltd conduct maintenance work in south China's Guangxi Zhuang Autonomous Region, Jan. 29, 2026. Railway departments nationwide are actively conducting train maintenance to ensure safe operations during the upcoming 2026 Spring Festival travel rush. (Xinhua/Zhang Ailin)

Workers of China Railway Nanning Group Co., Ltd conduct maintenance work in south China's Guangxi Zhuang Autonomous Region, Jan. 29, 2026. Railway departments nationwide are actively conducting train maintenance to ensure safe operations during the upcoming 2026 Spring Festival travel rush. (Xinhua/Zhang Ailin)

Workers of China Railway Nanning Group Co., Ltd conduct maintenance work in south China's Guangxi Zhuang Autonomous Region, Jan. 29, 2026. Railway departments nationwide are actively conducting train maintenance to ensure safe operations during the upcoming 2026 Spring Festival travel rush. (Xinhua/Zhang Ailin)

An aerial drone photo taken on Jan. 29, 2026 shows workers of China Railway Nanning Group Co., Ltd conducting maintenance work in south China's Guangxi Zhuang Autonomous Region. Railway departments nationwide are actively conducting train maintenance to ensure safe operations during the upcoming 2026 Spring Festival travel rush. (Xinhua/Zhang Ailin)

Workers of China Railway Nanning Group Co., Ltd conduct maintenance work in south China's Guangxi Zhuang Autonomous Region, Jan. 29, 2026. Railway departments nationwide are actively conducting train maintenance to ensure safe operations during the upcoming 2026 Spring Festival travel rush. (Xinhua/Zhang Ailin)

A staff member conducts maintenance work at a high-speed train base in Nanjing, east China's Jiangsu Province, Jan. 28, 2026. Railway departments nationwide are actively conducting train maintenance to ensure safe operations during the upcoming 2026 Spring Festival travel rush. (Photo by Yang Suping/Xinhua)

Staff members conduct maintenance work at a high-speed train base in Kunming, southwest China's Yunnan Province, Jan. 29, 2026. Railway departments nationwide are actively conducting train maintenance to ensure safe operations during the upcoming 2026 Spring Festival travel rush. (Photo by Yang Zixuan/Xinhua)

A staff member conducts maintenance work at a high-speed train base in Nanjing, east China's Jiangsu Province, Jan. 27, 2026. Railway departments nationwide are actively conducting train maintenance to ensure safe operations during the upcoming 2026 Spring Festival travel rush. (Photo by Xin Yi/Xinhua)

A staff member conducts maintenance work at a high-speed train base in Nanjing, east China's Jiangsu Province, Jan. 27, 2026. Railway departments nationwide are actively conducting train maintenance to ensure safe operations during the upcoming 2026 Spring Festival travel rush. (Photo by Yang Suping/Xinhua)

Staff members conduct maintenance work at a high-speed train base in Kunming, southwest China's Yunnan Province, Jan. 29, 2026. Railway departments nationwide are actively conducting train maintenance to ensure safe operations during the upcoming 2026 Spring Festival travel rush. (Photo by Yang Zixuan/Xinhua)

A staff member conducts maintenance work at a high-speed train base in Nanjing, east China's Jiangsu Province, Jan. 27, 2026. Railway departments nationwide are actively conducting train maintenance to ensure safe operations during the upcoming 2026 Spring Festival travel rush. (Photo by Xin Yi/Xinhua)